Yea, ok the roof on fire, let the motherfucker burn (Let it burn)

from Meek Mill (Ft. Cory Gunz, French Montana & Mase) – Right Now Lyrics on Rap Genius

Meaning

Meek starts of the song with a popular line with many rappers. Meek is simply on fire in this rap industry.
This is a reference that originated from “The Roof Is on Fire” a single from Rock Master Scott & the Dynamic Three.

It’s also a quite obvious reference to Meek’s song with Big SeanBurn.

The line is also used by 50 Cent on In Da Club, while the context could be a reference to Usher’s Burn.

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